// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:analysis_server/src/services/correction/dart/abstract_producer.dart';
import 'package:analysis_server/src/services/correction/fix.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer_plugin/utilities/change_builder/change_builder_dart.dart';
import 'package:analyzer_plugin/utilities/fixes/fixes.dart';
import 'package:analyzer_plugin/utilities/range_factory.dart';

class RemoveInitializer extends CorrectionProducer {
  @override
  FixKind get fixKind => DartFixKind.REMOVE_INITIALIZER;

  @override
  Future<void> compute(DartChangeBuilder builder) async {
    var parameter = node.thisOrAncestorOfType<DefaultFormalParameter>();
    if (parameter != null) {
      // Handle formal parameters with default values.
      await builder.addFileEdit(file, (DartFileEditBuilder builder) {
        builder.addDeletion(
            range.endEnd(parameter.identifier, parameter.defaultValue));
      });
    } else {
      // Handle variable declarations with default values.
      var variable = node.thisOrAncestorOfType<VariableDeclaration>();
      if (variable != null) {
        await builder.addFileEdit(file, (DartFileEditBuilder builder) {
          builder
              .addDeletion(range.endEnd(variable.name, variable.initializer));
        });
      }
    }
  }

  /// Return an instance of this class. Used as a tear-off in `FixProcessor`.
  static RemoveInitializer newInstance() => RemoveInitializer();
}
